Malicious PDF — malware analysis report

Static analysis result for SHA-256 446b17ef0e688d6c…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 18:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6552baeb48f128efde7d69f8e0a51ecb SHA-1: 3ae8718232be4bbeea07df5d8d1ac668bde42445 SHA-256: 446b17ef0e688d6c1de62657541798f0c937a4cf227fc35497e57cb0947290a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The numerous embedded URLs point to compromised CMS upload directories and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The primary attack pattern involves using the PDF as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vtaky.sk/media/file/rixum.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd45ee6a774---lezovedu.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0563f4ef7255c936ce1852fbe49ab865/sowuji.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607578b5b2c8f---68393399409.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/31ee9239e6f06302cc44ca39787cbd0f/76709408635.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fb67491c12092335c69d1a9fd23e44bf/35497068867.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc9a3414f98f6cddde385e53cdcc0134/5883421665.pdf
    • http://7tec.ru/userfiles/files/borapubevo.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b27388164---7632707520.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985276bfc31---ferizotipagorafu.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hiuracv6amhq9lejtms0aoll30/xuvebetuzajut.pdf
    • https://ksboutlet.com/file/files/23416631481.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/42e7b73ef51fcff56108ca19c97fb494/bazubirudigasixa.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8ab410b3---dazixitolaxakekum.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/92fa06581225296fb2c879f87a6de262/zikesuzudaronovo.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a4a36ba9cfd61557193e8d768ec68b49/21977532430.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/fee3cea99fc37ea04f682aa0d83c39f5/jazejo.pdf
    • http://kutyasturak.hu/images/files/folusevuzominoboduz.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bee74ec2349---442729930.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5782ea582---loxoxuripurasolag.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca21357941---biwagogurinoxanupuzeno.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56804b667---31501806327.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8d6d2520b1cf9c997e12c4315b0824e1/76297549552.pdf
    • https://amrapalispot.com/userfiles/file/welagedo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=joined+at+the+hip
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001006d.bin
4a8577f6be10b16ff55d66f850fd5ab637b32fe77a4373eaa6bdc761702aeed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 17128 bytes
font_01_sfnt_off00012d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 16792 bytes
font_02_sfnt_off00014526.bin
b45473a6fd8519f793e7c9f3561065aa1f647179d6be3093441e33dde59d9ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14526 10168 bytes

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